document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=972197>Question 972197</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A newspaper article about the results of a poll states: \"In theory, the results of such a poll, in 99 cases out of 100 should differ by no more than 5 percentage points in either direction from what would have been obtained by interviewing all voters in the United States.\" Find the sample size suggested by this statement </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #594582 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=594582\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> sample size is a function of the z value and error\r<BR>\n" );
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document.write( "error= z/sqrt(n)<BR>\n" );
document.write( "error^2=z^2/n\r<BR>\n" );
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document.write( "Therefore, n= z^2/error^2<BR>\n" );
document.write( "=2.33^2/0.05^2\r<BR>\n" );
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document.write( "=2172\r<BR>\n" );
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document.write( "For 2 SDs, 100/error rate in % is about the square root of the sample size. </SPAN>\n" );
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